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The Practical Pumping Handbook .......................................... ::::::::::::::::::::::

Figure 8.10: Fan pump (Reproduced with permission of Sulzer Pumps)

in reducing these shocks by modifying the vanes to the staggered and
angled configuration evident in Figure 8.10.
It is also worthwhile to note that pressure pulsations can also be traced
to shaft misalignment between pump and driver, and also to the relative
position of the pump operating point to the B EP.
In other words, in addition to all the special considerations identified in
this article, a stock pump is still a pump. Consequently it will be
dependent on the same conditions of selection, installation, operation
and maintenance as all other types of process pumps.

8.2.5 Determination of pump performance
The charts in Figure 8.11 show approximate head-capacity correction
factors (K p) for paper stock suspensions applied to water performance.
Correction factors are given at various percentages of maximum
efficiency capacity (Q p) for common consistencies.
Thc correction factors arc approximate for normally refined stock of
400-600 SR seconds freeness, with short direct suction lines of ample
size. Free or poorly agitated stocks and those with entrained air may
require greater corrections. Slow stocks and stocks containing fillers and
additives may require less correction.